JarCastingDecode According to the WHATWG Encoding Standard
This package provides a thin layer on top of iconv-lite which makes it expose some of the same primitives as the Encoding Standard.
const whatwgEncoding = require("whatwg-encoding");
console.assert(whatwgEncoding.labelToName("latin1") === "windows-1252");
console.assert(whatwgEncoding.labelToName(" CYRILLic ") === "ISO-8859-5");
console.assert(whatwgEncoding.isSupported("IBM866") === true);
// Not supported by the Encoding Standard
console.assert(whatwgEncoding.isSupported("UTF-32") === false);
// In the Encoding Standard, but this package can't decode it
console.assert(whatwgEncoding.isSupported("x-mac-cyrillic") === false);
console.assert(whatwgEncoding.getBOMEncoding(new Buffer([0xFE, 0xFF])) === "UTF-16BE");
console.assert(whatwgEncoding.getBOMEncoding(new Buffer([0x48, 0x69])) === null);
console.assert(whatwgEncoding.decode(new Buffer([0x48, 0x69]), "UTF-8") === "Hi");
API
decode(buffer, fallbackEncodingName): performs the decode algorithm (in which any BOM will override the passed fallback encoding), and returns the resulting stringlabelToName(label): performs the get an encoding algorithm and returns the resulting encoding's name, ornullfor failureisSupported(name): returns whether the encoding is one of the encodings of the Encoding Standard, and is an encoding that this package can decode (via iconv-lite)getBOMEncoding(buffer): sniffs the first 2–3 bytes of the suppliedBuffer, returning one of the encoding names"UTF-8","UTF-16LE", or"UTF-16BE"if the appropriate BOM is present, ornullif no BOM is present
Unsupported encodings
Since we rely on iconv-lite, we are limited to support only the encodings that they support. Currently we are missing support for:
- ISO-2022-JP
- ISO-8859-8-I
- replacement
- x-mac-cyrillic
- x-user-defined
Passing these encoding names will return false when calling isSupported, and passing any of the possible labels for these encodings to labelToName will return null.
Credits
This package was originally based on the excellent work of @nicolashenry, in jsdom. It has since been pulled out into this separate package.
Alternatives
If you are looking for a JavaScript implementation of the Encoding Standard's TextEncoder and TextDecoder APIs, you'll want @inexorabletash's text-encoding package.
